Solo streamer

RV, FWIW, but as I recall, you have a Schiit Loki. A lot of 'brightness' folks seem to complain originates in the upper-mid frequencies, i.e. 1500 to 3000 hz. Mostly on sources. Your complaint seems to be (logically anyway) coming from your sources and/or the recordings).  I think your CJ may have a tape loop. If so I'd suggest that you put the Loki in the loop and when you encounter that brightness flip on the loop switch and fiddle with the 2K knob some and see if the brightness goes away. You could put the Loki between your source and preamp but that is something I'd not  do if I really loved your source. Maybe a better solution, and a lot cheaper anyway, than by shopping other sources or wires which might just bring you different problems. Good luck.

@newbee

Thanks for your suggestion and your good wishes.
I had actually forgotten about the Loki. You have a good memory. It was removed years ago because It didn’t get much use at all.
I spoke of the brightness when the Aurender was first installed. I can’t remember it happening lately at all.   The Shunyata cable should enhance the sound even more, I hope.

@rvpiano when does the new USB cable arrive? 

Tomorrow, Thursday.

Interested in your thoughts.